As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT BETWEEN 24-25,000 FT, THE RT PACK CLOSED AND THE ACFT STARTED TO DEPRESSURIZE. STARTED A DESCENT AND RESET THE PACK AROUND 18,000 FT & IT STARTED TO PRESSURIZE THE CABIN. CABIN ALTITUDE REACHED 9000 FT. NO MASKS DROPPED. R & R RT 10TH STAGE VALVE BLEED AIR SHUTOFF IAW AMM. OPS AND AIR LEAK CHECKED GOOD.